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In an op-ed in the Wall Street Journal, (subscriber only) they summarize their findings as follows: Seventeen years after recognizing same-sex relationships in Scandinavia there are higher marriage rates for heterosexuals, lower divorce rates, lower rates for out-of-wedlock births, lower STD rates, more stable and durable gay relationships, more monogamy among gay couples, and so far no slippery slope to polygamy, incestuous marriages, or “man-on-dog” unions. From the op-ed:

[T]here is no evidence that allowing same-sex couples to marry weakens the institution. If anything, the numbers indicate the opposite. A decade after Denmark,
Norway and Sweden passed their respective partnership laws, heterosexual marriage rates had risen 10.7% in Denmark; 12.7% in Norway; and a whopping 28.8% in Sweden. In Denmark over the last few years, marriage rates are the highest they’ve been since the early 1970s. Divorce rates among heterosexual couples, on the other hand, have fallen. A decade after each country passed its partnership law, divorce rates had dropped 13.9% in Denmark; 6% in Norway; and 13.7% in Sweden. On average, divorce rates among heterosexuals remain lower now than in the years before same-sex partnerships were legalized.

In addition, out-of-wedlock birthrates in each of these countries contradict the suggestion by social conservatives that gay marriage will lead to great increases in out-of-wedlock births and therefore less family stability for children. In Denmark, the percentage of out-of-wedlock births was 46% in 1989; now it is 45%. In Norway, out-of-wedlock births jumped from 14% in 1980 to 45% right before partnerships were adopted in 1993; now they stand at 51%, a much lower rate of increase than in the decade before same-sex unions. The Swedish trend mirrors that of Norway, with much lower rates of increase post-partnership than pre-partnership.

Is there a correlation, then, between same-sex marriage and a strengthening of the institution of marriage? It would be difficult, and suspect, to establish a cause-and-effect relationship between these trends in heterosexual marriage and marriage rights for gays and lesbians. But the facts demonstrate that there is no proof that same-sex marriage will harm the institution of marriage, or children. An optimistic reading of the facts might even suggest that the energy and enthusiasm that same-sex couples bring to the institution of marriage may cause unmarried heterosexual couples to take a fresh look at marriage as an option.